<?php
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Modified by: Miguel Fermín
* Based in: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
* 
* This program is free software; you can redistribute it and/or 
* modify it under the terms of the GNU General Public License 
* as published by the Free Software Foundation; either version 2 
* of the License, or (at your option) any later version.
* 
* This program is distributed in the hope that it will be useful, 
* but WITHOUT ANY WARRANTY; without even the implied warranty of 
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
* GNU General Public License for more details: 
* http://www.gnu.org/licenses/gpl.html
*/

class SimpleImage {
   
	var $image;
	var $image_type;

	function __construct($filename = null){
		if(!empty($filename)){
			$this->load($filename);
		}
	}

	function load($filename) {
		$image_info = getimagesize($filename);
		$this->image_type = $image_info[2];

		if( $this->image_type == IMAGETYPE_JPEG ) {
			$this->image = imagecreatefromjpeg($filename);
		} elseif( $this->image_type == IMAGETYPE_GIF ) {
			$this->image = imagecreatefromgif($filename);
		} elseif( $this->image_type == IMAGETYPE_PNG ) {
			$this->image = imagecreatefrompng($filename);
		} else {
			throw new Exception("The file you're trying to open is not supported");
		}
	}

	function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {
		if( $image_type == IMAGETYPE_JPEG ) {
			imagejpeg($this->image,$filename,$compression);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			imagegif($this->image,$filename);         
		} elseif( $image_type == IMAGETYPE_PNG ) {
			imagepng($this->image,$filename);
		}   
		if( $permissions != null) {
			chmod($filename,$permissions);
		}
	}

	function output($image_type=IMAGETYPE_JPEG, $quality = 80) {
		if( $image_type == IMAGETYPE_JPEG ) {
			header("Content-type: image/jpeg");
			imagejpeg($this->image, null, $quality);
		} elseif( $image_type == IMAGETYPE_GIF ) {
			header("Content-type: image/gif");
			imagegif($this->image);         
		} elseif( $image_type == IMAGETYPE_PNG ) {
			header("Content-type: image/png");
			imagepng($this->image);
		}
	}

	function getWidth() {
		return imagesx($this->image);
	}

	function getHeight() {
		return imagesy($this->image);
	}

	function resizeToHeight($height) {
		$ratio = $height / $this->getHeight();
		$width = $this->getWidth() * $ratio;
		$this->resize($width,$height);
	}

	function resizeToWidth($width) {
		$ratio = $width / $this->getWidth();
		$height = $this->getHeight() * $ratio;
		$this->resize($width,$height);
	}

	function square($size){
		$new_image = imagecreatetruecolor($size, $size);

		if($this->getWidth() > $this->getHeight()){
			$this->resizeToHeight($size);

			imagecolortransparent($new_image, imagecolorallocate($new_image, 0, 0, 0));
			imagealphablending($new_image, false);
			imagesavealpha($new_image, true);
			imagecopy($new_image, $this->image, 0, 0, ($this->getWidth() - $size) / 2, 0, $size, $size);
		} else {
			$this->resizeToWidth($size);

			imagecolortransparent($new_image, imagecolorallocate($new_image, 0, 0, 0));
			imagealphablending($new_image, false);
			imagesavealpha($new_image, true);
			imagecopy($new_image, $this->image, 0, 0, 0, ($this->getHeight() - $size) / 2, $size, $size);
		}

		$this->image = $new_image;
	}
   
	function scale($scale) {
		$width = $this->getWidth() * $scale/100;
		$height = $this->getHeight() * $scale/100; 
		$this->resize($width,$height);
	}
   
	function resize($width,$height) {
		$new_image = imagecreatetruecolor($width, $height);

		imagecolortransparent($new_image, imagecolorallocate($new_image, 0, 0, 0));
		imagealphablending($new_image, false);
		imagesavealpha($new_image, true);

		imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
		$this->image = $new_image;   
	}
        function cut($x, $y, $width, $height){
           $new_image = imagecreatetruecolor($width, $height);	
           imagecopy($new_image, $this->image, 0, 0, $x, $y, $width, $height);
		$this->image = $new_image;
	}
	function maxarea($width, $height = null){
		$height = $height ? $height : $width;

		if($this->getWidth() > $width){
			$this->resizeToWidth($width);
		}
		if($this->getHeight() > $height){
			$this->resizeToheight($height);
		}
	}

	function cutFromCenter($width, $height){

		if($width < $this->getWidth() && $width > $height){
			$this->resizeToWidth($width);
		}
		if($height < $this->getHeight() && $width < $height){
			$this->resizeToHeight($height);
		}

		$x = ($this->getWidth() / 2) - ($width / 2);
		$y = ($this->getHeight() / 2) - ($height / 2);

		return $this->cut($x, $y, $width, $height);
	}
}
/*
// Usage:
// Load the original image
$image = new SimpleImage('imagen.jpg');

// Resize the image to 600px width and the proportional height
$image->resizeToWidth(600);
$image->save('imagen_resized.jpg');

// Create a squared version of the image
$image->square(200);
$image->save('imagen_squared.jpg');

// Scales the image to 75%
$image->scale(75);
$image->save('imagen_scaled.jpg');

// Resize the image to specific width and height
$image->resize(80,60);
$image->save('imagen_resized2.jpg');

// Output the image to the browser:
$image->output();
*/
?>